2
HG-8 COLD CLIMATE FLUSHING SYSTEM
Installation Instructions
GENERAL
INSTALLATION
Site Evaluation
Each Hydro-Guard Unit installation
is unique and will require a
minimum of advance planning.
Prior to the installation of the
device, the drainage patterns for
the intended installation location
should be reviewed. The drainage
pattern must permit discharged
water to flow away from the Hydro-
Guard Unit. Discharged water
flushed from the Hydro-Guard
Unit must be routed away from
the device. It is recommended
that a 6" catch pipe (by others)
Overview
The Hydro-Guard HG-8 Cold Climate
Unit, is the industry’s only Sub-
Surface Discharge, programmable
flushing apparatus. This Unit is
suitable for year-round use in cold
climates. This Automatic Flushing
System has been designed,
engineered, and manufactured to
provide outstanding dependability
and performance.
Please read and retain this manual
for future reference, training,
troubleshooting, and maintenance.
Hydro-Guard HG-8 Cold Climate
Flushing Unit
The Hydro-Guard HG-8 Unit is
housed in a Mueller Thermal-Coil
Box that is approximately 21
inches in diameter. The bury depth
will vary depending upon the depth
of the utility’s water lines. The box
is constructed with low lead NTP
male threads and is to be placed
by the contractor at a location
agreed upon by the end user. The
box features coiled tubing that will
route water from the water utility’s
potable water distribution line to
the meter assembly, through the
HG-8’s flushing components, and
discharge through a discharge
service routed to an acceptable
point of discharge (i.e., a storm
sewer, swale, storm pond, etc.).
The meter and flushing assembly
can be raised for maintenance and
repair and then lowered back down
into the box below the frost line.
A medium density foam insulation
pad, freeze protection system,
and composite lid help protect the
flushing and meter assembly from
freezing in the winter.
WARNING: Proper lifting,
loading / unloading tools and
techniques must be followed
when handling this device.
Damage to working components
can occur if dropped.
be installed inside of the HG-8’s
external cabinet. The catch pipe
shall be mounted at least 3" under
the discharge piping of the HG-8
(see Typical Installation illustration).
The 6" pipe shall be installed
a minimum of 24" below grade
before a 90-degree bend or pipe
size reduction. If desired, the 6"
pipe can be reduced to a 3" or 4"
pipe to continue the routing of the
flow to a final discharge point. The
recommended final discharge points
may include a storm drain, drainage
or retention pond, or a storm swale.
!
1.
Remove the Hydro-Guard Unit
from its packaging and inspect for
possible damage during shipping.
2.
Turn off the service line feed.
3.
Excavate a suitably sized ditch
ensuring it is connected on one side
to the utility’s service line trench.
Remove any debris that might
create uneven pressure on the Unit.
Compact the bottom of the hole
in order to minimize settling after
installation. Place #57 stone. Then,
place non-compacted clean bedding
material within the bottom of the
hole. Provide a bed of crushed
gravel approximately 6 inches thick
or place bricks or cement blocks
below the pit to allow for drainage
and provide support.
TYPICAL INSTALLATION
Cast Iron Vault Lid
Double Check Valve
1" Mueller Systems
Meter Sold Separately
8-Tablet Dechlorination
Supply
(By Others)
1" Male
Thread Ends
Discharge (By Others)
Grade
Ground
Programmer
